鄂尔多斯盆地镇泾地区长8油层组成岩作用与定量孔隙演化
发布时间:2018-08-14 09:59
【摘要】:鄂尔多斯盆地南部地区上三叠统延长组是盆地主要的产油层位。但是,延长组油层具有低孔特低渗、特低孔超低渗的特征,造成油气藏比较隐蔽进而产量低,增加油气勘探开发的难度。成岩作用直接控制储层的微观孔隙结构,决定储层的孔渗条件。因此,在对长8油层组成岩作用进行研究的基础上,找到造成储层低孔低渗的因素,并对储层物性演化做定量分析,可以进一步加深对储层的认识。镇泾油田位于鄂尔多斯盆地天环拗陷的南端,毗邻渭北隆起,地层平缓,构造简单,局部发育范围较小的鼻状隆起,低幅度鼻状隆起为油气相对富集提供了有利条件。研究区长8油层组岩性为粉、细砂岩与泥岩互层。沉积相为水下分流河道、分流间湾微相,形成的砂体层厚,分布广,物性好,形成了镇泾地区主要的储油层。通过铸体薄片分析、电镜分析等实验手段,分析研究区储层岩石学特征和成岩作用,得出:(1)砂岩以细粒为主,分选中等-好,次棱状磨圆,成分上石英含量相对较低,岩石定名为长石岩屑砂岩和岩屑长石砂岩。(2)通过镜下观察,认为绿泥石胶结作用对储集岩的孔渗性能起到有利作用,而方解石胶结作用及压实作用使储集岩孔渗性能降低,在储层原生孔隙保存较好的层段,溶蚀作用对储层物性的影响较大。根据各种镜下成岩作用现象,确定成岩序列,判断储层成岩阶段达中成岩A期。(3)研究区从东往西依次划分出绿泥石膜-方解石胶结相带、长石-浊沸石溶蚀相带、泥质杂基填隙相带、长石溶蚀相带以及高岭石相带等五个大的成岩相带,各成岩相带物性有所差异。储层以粒间孔为主,其孔隙度值约为10.1%。结合对储层孔隙类型、喉道特征及孔隙结构特征的研究,分别从沉积、成岩和构造三方面讨论储集体孔渗条件的控制因素。通过分选系数的计算对储层初始孔隙度进行恢复,经压实作用、溶蚀作用以及胶结作用等一系列成岩作用过程,在对成岩储层做成岩相分类的基础上,绘制各个成岩相中储层孔隙度的演化曲线。
[Abstract]:The Yanchang formation of Upper Triassic in southern Ordos Basin is the main oil-producing zone in the basin. However, the Yanchang formation has the characteristics of low porosity and low permeability and ultralow permeability, which leads to the subtle reservoir and low production, which makes exploration and development of oil and gas more difficult. Diagenesis directly controls the microscopic pore structure of the reservoir and determines the pore and permeability conditions of the reservoir. Therefore, on the basis of the study of the formation rock action of Chang 8 oil reservoir, the factors that cause the low porosity and low permeability of the reservoir and the quantitative analysis of the evolution of the reservoir physical properties can further deepen the understanding of the reservoir. Zhenjing oilfield is located at the southern end of Tianhuan depression in Ordos basin, adjacent to Weibei uplift. The formation is smooth, the structure is simple, the local development range is small, and the low amplitude nasal uplift provides favorable conditions for the relative enrichment of oil and gas. The lithology of Chang 8 oil formation in the study area is silt, fine sandstone and mudstone interbedded. The sedimentary facies are subaqueous distributary channel and interdistributary bay microfacies, forming thick sand body, wide distribution and good physical properties, forming the main reservoir in Zhenjing area. The petrological characteristics and diagenesis of reservoirs in the study area are analyzed by means of casting thin slice analysis and electron microscope analysis. The results show that: (1) the sandstone is mainly fine-grained, the separation is medium to good, the secondary prism is round, and the content of quartz in the composition is relatively low. The rock is named feldspathic lithic sandstone and lithic feldspathic sandstone. (2) through microscopic observation, it is considered that chlorite cementation plays a beneficial role in the porosity and permeability of reservoir rock, while calcite cementation and compaction make reservoir pore and permeability performance lower. In the reservoir where the primary pores are well preserved, the dissolution has a great influence on the reservoir physical properties. According to various diagenesis phenomena under the mirror, diagenesis sequence is determined, and the diagenetic stage of reservoir reaches diagenesis A stage. (3) from east to west, the study area is divided into chlorite film-calcite cementation facies zone, feldspar and clinopalite dissolution facies zone. There are five large diagenetic facies belts, such as muddy complex base filling gap zone, feldspar dissolution facies belt and kaolinite facies belt, and the physical properties of each diagenetic facies belt are different. The reservoir is dominated by intergranular pore, and its porosity is about 10.1. Based on the study of reservoir pore types, throat characteristics and pore structure characteristics, the controlling factors of reservoir pore and permeability conditions are discussed from three aspects: deposition, diagenesis and structure. Through the calculation of sorting coefficient, the initial porosity of reservoir is restored. After a series of diagenesis processes, such as compaction, dissolution and cementation, the diagenetic reservoir is classified into lithofacies. Draw the evolution curve of reservoir porosity in each diagenetic facies.
【学位授予单位】:山东科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P618.13
[Abstract]:The Yanchang formation of Upper Triassic in southern Ordos Basin is the main oil-producing zone in the basin. However, the Yanchang formation has the characteristics of low porosity and low permeability and ultralow permeability, which leads to the subtle reservoir and low production, which makes exploration and development of oil and gas more difficult. Diagenesis directly controls the microscopic pore structure of the reservoir and determines the pore and permeability conditions of the reservoir. Therefore, on the basis of the study of the formation rock action of Chang 8 oil reservoir, the factors that cause the low porosity and low permeability of the reservoir and the quantitative analysis of the evolution of the reservoir physical properties can further deepen the understanding of the reservoir. Zhenjing oilfield is located at the southern end of Tianhuan depression in Ordos basin, adjacent to Weibei uplift. The formation is smooth, the structure is simple, the local development range is small, and the low amplitude nasal uplift provides favorable conditions for the relative enrichment of oil and gas. The lithology of Chang 8 oil formation in the study area is silt, fine sandstone and mudstone interbedded. The sedimentary facies are subaqueous distributary channel and interdistributary bay microfacies, forming thick sand body, wide distribution and good physical properties, forming the main reservoir in Zhenjing area. The petrological characteristics and diagenesis of reservoirs in the study area are analyzed by means of casting thin slice analysis and electron microscope analysis. The results show that: (1) the sandstone is mainly fine-grained, the separation is medium to good, the secondary prism is round, and the content of quartz in the composition is relatively low. The rock is named feldspathic lithic sandstone and lithic feldspathic sandstone. (2) through microscopic observation, it is considered that chlorite cementation plays a beneficial role in the porosity and permeability of reservoir rock, while calcite cementation and compaction make reservoir pore and permeability performance lower. In the reservoir where the primary pores are well preserved, the dissolution has a great influence on the reservoir physical properties. According to various diagenesis phenomena under the mirror, diagenesis sequence is determined, and the diagenetic stage of reservoir reaches diagenesis A stage. (3) from east to west, the study area is divided into chlorite film-calcite cementation facies zone, feldspar and clinopalite dissolution facies zone. There are five large diagenetic facies belts, such as muddy complex base filling gap zone, feldspar dissolution facies belt and kaolinite facies belt, and the physical properties of each diagenetic facies belt are different. The reservoir is dominated by intergranular pore, and its porosity is about 10.1. Based on the study of reservoir pore types, throat characteristics and pore structure characteristics, the controlling factors of reservoir pore and permeability conditions are discussed from three aspects: deposition, diagenesis and structure. Through the calculation of sorting coefficient, the initial porosity of reservoir is restored. After a series of diagenesis processes, such as compaction, dissolution and cementation, the diagenetic reservoir is classified into lithofacies. Draw the evolution curve of reservoir porosity in each diagenetic facies.
【学位授予单位】:山东科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P618.13
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